Add support for processing BTC deposits

[MakMuftic]

Add support for processing deposits on the Bitcoin network.

Implementation details

• The deposit addresses will be provided through shared configuration or as a new configuration parameter for the indexer.
• Deposit represents a transaction sending BTC to one of the deposit addresses

Testing details

• Add appropriate unit tests

Acceptance Criteria

• Scenario: Add support for processing BTC deposits
• Given the implementation details are followed
• When a deposit transaction is sent to one of the deposit addresses
• Then, the indexer processes the deposit and saves it to the database

QA details

• Make sure the indexer processes deposits on Bitcoin and saves them to the database